Bug 17844: Replace C4::Koha::get_notforloan_label_of with Koha::AuthorisedValues

Bug 17844: Replace C4::Koha::get_notforloan_label_of with Koha::AuthorisedValues

This patch is more a bugfix than a refactoring.
Indeed the C4::Koha::get_notforloan_label_of behaviors were buggy:
1/ It does not display the opac description at the OPAC, but always the
staff description
2/ It does not care of the framework of the biblio, but retrieve the
first row of the marc_subfield_structure mapped with items.notforloan

These 2 bugs can easily be fixed using the
Koha::AuthorisedValues->search_by_koha_field

Steps to recreate the issues:
- Create 2 authorised value categories for not for loan (NFL1 and NFL2)
with the same values. Define a different description for the OPAC.
- Define link 952$7 to NFL1 for the default framework and to NFL2 for
the BK framework
- Create 2 bibliographic records (B1 using NFL1 and B2 using NFL2) with
2 items each (1 item should have a not for loan value)
- Go to the "Place a hold" view for this record.
- In the item list, you should see the not for loan value
=> The staff description of NFL1 will always be used, even for the OPAC

Test plan:
- Recreate the issues without this patchset
- Apply this patchset
- Recreate the steps to recreate the issues
=> The staff description of NFL2 should be displayed for the B2 item
=> The opac description of NFL2 should be displayed for the B2 item at
the OPAC

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>